OK... I've been beating my head against this very simple problem for an hour now when it occurred to me to ask the question here. This one should be really easy... unfortunately it's not for me at the moment. I've been up for 22 hours, and my brain is mushed... here's a really easy 500 pointer for someone that can come up with an elegant solution.
Problem: I have a query that returns a set of records that will provide content for a page. I have navigational elements that will allow for changing the display of the current record (just like standard navigation buttons - << , < , > , >>). All they need to do is move the current pointer to the first, previous, next, and last record in the query. Now what I'm doing is requesting the file details which will build the page from a function in an external component (as a public method).
So essentially I'll just have the record ID for the current record. What I want to be able to work with in navigation is this:
Providing the current detail record ID, and having a query of all detail records within the parent - return the current pointer location (the query is ordered by date) and the record ID's for the First, Prev, Next, Last records in the query. It would be preferrable if the solution returned all the results in a single variable (either a structure or a List).
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I through this together real quick but hopefully it will give you some ideas:
<cfquery name="qryData">
SELECT ID, ...
FROM SomeTable
ORDER BY SomeDateField
</cfquery>
<!--- Turn the ID column into a list --->
<cfset strDataIDList = ValueList(qryData.ID)>
<!--- Add the first ID of the list --->
<cfset strNavList = ListFirst(strDataIDList)>
<!--- Find the position for the current ID in the list --->
<cfset intPosition = ListFind(strDataIDList, intCurrentID)>
<!--- Use the current ID position to find the prev and next IDs --->
<cfset strNavList = strNavList & "," & ListGetAt(strDataIDList, (intCurrentID-1))>
<cfset strNavList = strNavList & "," & ListGetAt(strDataIDList, (intCurrentID+1))>
<!--- Finally, get the last ID of the list --->
<cfset strNavList = strNavList & "," & ListLast(strDataIDList)>
<!--- You could then use a CF query of queries to get your current record data instead of making another call to the database --->
<cfquery name="qryCurrentData" dbtype="query">
SELECT ID, ...
FROM qryData
WHERE ID = <cfqueryparam cfsqltype="cf_sql_integer"
</cfquery>
You may need to through in some error checking incase you are already at the beginning or end of the list. Hope this helps.
check this link out to know about paging recordsets
if u have any doubts, just ask and i will help u out
http://oldlook.experts-exc
Regards
Hart
take a look at my similar previous post - it cld probably help u out !
http://www.experts-exchang
http://www.experts-exchang
K'Rgds
Anand
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by: digicidalPosted on 2004-02-16 at 04:12:20ID: 10371170
I know I can get queryName.currentRow as a value and then make then maybe read the value of currentRow -1 and currentRow +1, but I can't seem to keep it all straight in my head right now.